It is a common problem. Are you able to go off Khan Academy, or are you on a restricted account? There is a fix for the problem, but you probably need to be on an account which can look up a GitHub page to use it.
You will also need to be able to install a bookmarklet in your browser. That's fine if you have a dedicated laptop or similar for using Khan Academy, but if you switch between several devices it will be less useful.

Let me know if you want to hear about the fix.

To add further clarification, I believe this issue only occurs on the programming talk-throughs. Notification links to posts on regular videos and articles should work correctly.

If the link doesn't work, one thing you can do is change the "Sort By" filter to "Recent". I was able to find all three of your questions that were posted on programming talk-throughs in the first page of questions when sorted by most recent.

If the link doesn't work, one thing you can do is change the "Sort By" filter to "Recent".

This helped. Thank you so much!

Let me know if you want to hear about the fix.

I appreciate your response! Although I found a way to go about it, as you can see by Evan Lewis response, at least so long as the comment was still new. :)

Thank you both!